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第六讲延时开关电路延时开关电路有两种,一种是延时关电路,比如有的楼道照明灯就是这种电路,我们只须将开关按一下,照明灯亮一会儿,就自动熄灭了;另一种是延时开电路,比如自动爆破,就需要经过一段时间电路自动接通,引燃炸药爆炸。一、预备知识 1.在延时开关电路里,我们将用到一个新的元件——按键开关。按键开关只有按下去开关才接通,一松手开关就会自动断开。按键开关种类有很多,我们在组装延时开关电路里用的是一种电话机上常用的按键开关,外观如图1。
Sixth, delay switch circuit delay switch circuit has two kinds, one is the delay off the circuit, such as some corridor lighting is this circuit, we only need to press the switch, the light bright for a while, it automatically extinguished ; The other is delayed open circuit, such as automatic blasting, you need to automatically turn on the circuit after a period of time, igniting explosive explosions. First, the preparatory knowledge 1. In the delay switch circuit, we will use a new component - the key switch. Only by pressing the switch to switch off the switch, a switch will automatically disconnect. There are many types of key switches, switch delay circuit in the assembly we use a commonly used telephone keypad switch, the appearance of Figure 1.